Mathematics, 30.05.2020 11:58, dogerboy8380

While working on a roof, Rob dropped his hammer. The hamer's fall can be represented by the equation h=-16t^2+20 (where t=time in seconds and h=height in feet) How long will it take the hammer to reach the ground?

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While working on a roof, Rob dropped his hammer. The hamer's fall can be represented by the equation...